/Engine/Source/Runtime/Engine/Classes/Materials/MaterialInterface.h
Re-caches uniform expressions for all material interfaces Set bRecreateUniformBuffer to true if uniform buffer layout will change (e.g.FMaterialis being recompiled). In that case calling needs to useFMaterialUpdateContextto recreate the rendering state of primitives using this material.
static void RecacheAllMaterialUniformExpressions ( bool bRecreateUniformBuffer )